Malicious PDF — malware analysis report

Static analysis result for SHA-256 c79371835c8053cf…

MALICIOUS

PDF

38.8 KB Created: 2020-08-19 01:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c9060ae62ef24c9ac33a2fbfea13884 SHA-1: 09b083fe37cc42601e8caa8e017b0e041034d112 SHA-256: c79371835c8053cf09c82f867e4e0e8782bcf50ceec3a2a8565bf1e66e5763ea
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a malicious redirector link disguised as a download button, aiming to trick users into clicking it. The link leads to 'https://ttraff.cc/pify?keyword=baidu+root+apk+2018', which is a known malicious redirector. The document also hosts a large number of external PDF links, many of which are benign, but the presence of the malicious redirector is the primary indicator of compromise.

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/pify?keyword=baidu+root+apk+2018
    • http://files.vnchha.com/uploads/1/3/1/0/131071240/dcda938399c.pdf
    • http://files.kellgallaher.com/uploads/1/3/1/1/131164488/8ef92a.pdf
    • http://wesusibix.shelburnescouting.com/uploads/1/3/1/4/131407241/83171dffceb.pdf
    • https://cdn.shopify.com/s/files/1/0439/8258/6014/files/public_health_nutrition_carter_center.pdf
    • https://cdn.shopify.com/s/files/1/0437/7336/2325/files/davetopujusefikor.pdf
    • https://cdn.shopify.com/s/files/1/0431/2891/4074/files/autodesk_autocad_2015_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0430/8097/4490/files/cataclysm_dda_soundpack.pdf
    • https://cdn.shopify.com/s/files/1/0432/7129/1035/files/embryology_notes_for_medical_students_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/2936/3878/files/zelevidipepisevodoxi.pdf
    • https://cdn.shopify.com/s/files/1/0431/9461/3924/files/83227146561.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zabaravoxetifup.pdf
    • https://cdn.shopify.com/s/files/1/0430/7514/1783/files/37444786775.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000059ff.bin
5c14d6d04da6f8e67bb1bcec91732f6c73f0e29440683ccb4f11a67a3383e6ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59FF 5376 bytes
font_01_sfnt_off00006c58.bin
6850e90124cc677601238762a8759ed50d20e57e33eae05a27ccf935bc84faba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C58 10152 bytes

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